Rock-drilling engine.



J. A. TRAYLOB.. ROCK DRILLING ENGINE. APPLICATION 111.1111 1111.10, 1m.

Patented Jan. 12, 1909.

UNITED STATES PATENT onirica.

JOHN A. TRAYLOR, OF DENVER, COLORADO, ASSIGNOR TO THE JOHN A. TRAYLORMA- CHINERY COMPANY, OF DENVER, COLORADO, A CORPORATION OF COLORADO.

ROCK-DBILLING ENGINE.

To cZZ whom it may concer/n.:

Be it known that I, J oH-N A. TaAYLoR, a citizen of the United States ofAmerica, residing at the city and county oi Denver and State ofColorado, have invented a new and useful Rock-Drilling Engine, oi whichthe following is a speciiication.

My invention relates to im rovements in rock drills, and the objects omy invention are: to provide a rock drilling engine having a packingdevice through which the drill' bits are thrust when they are insertedinto the rock drilling engine, that is adapted to prevent the escape ofthe actuating fluid from the cylinder along the drill bits to theatmosphere. I attain these objects by the mechanism illustrated in theaccompanying drawings, in which:

Figure 1, is a longitudinal, sectional view through the drilling engineand the air feed cylinder, by which the said engine and its drill bitare held against the face of the rock, and fed forward as the drill cutsinto the rock. Fig. 2, is a iront elevation of the drilling engine.Figs. 3 and 4, are views of the fluid inlet valve, showing the ositionof the said valve when the fluid is a mitted to the feed cylinder only,and also when the fluid is admitted to the feed cylinder and to thehammer piston cylinder simultaneously and Fig. 5, is a sectional view onthe line 5-5 of Fig. 1.

Similar letters of reference refer to similar parts throughout theseveral views.

Referring to the drawings, the numeral 1, designates the cylinder of myrock drill. This cylinder is provided with a main cylindrical bore oftwo diameters 2 and 3, in which a piston 4, which is also made in twodiameters, is reciprocally fitted. Annular port portions 5 and 6 areformed in the rear end ortion ofy said cylinders bore, and an annuarexhaust chamber 7 is formed at the forwarld end of the cylinder aroundthe forward end of the hammer piston, and this chamber is provided withan outlet port 7^. From the forward end of the piston bore, a smallerlshort axial bore 8 is formed in the c linder, through which the rearend of a drill bit 9 passes, said bit being rovided with a lon itudinalpassage 9^, w ich extends entire y throu h it. rThis aperture 8, isntersected by a arger axial bore 10, that extends into the cylinder fromits forward end, and which is threaded. `A drill bit holding chuck 11 isthreaded to screw into the axial bore 10.

Specication of Lettere Patent. Application filed. January 10, 1908.Serial No. &1Q,1 .53.

Patented Jan. 12, 1909.

This chuck projects out from the end of the cylinder, and is providedwith a wrench receiving end. An axial aperture 12 is also formed throughit, in which the shank end of the drill bit is inserted, anda collar 13is formed on the drill bit, which bears against the chuck. A packing cap14 is inserted in the bottom of the bore 10, which consists .of a ringportion. 15, provided with a hub portion 16. This cap is made of anysuitable flexible material, such as leather, rubber, or special packingmaterials, and the chuck is screwed tightly against its flange portion,`and clamps it between the inner end of the chuck and the bottom of theaperture 10. The hollow hub portion 16 of this flexible packing capextends loosely into the axial ore 8 of the cylinder, and it is made tofit snugly around the shank end of the drill bit, and as it fits looselyin the aperture 8, the air pressure from the cylinder forces thisflexible hub ortion of the cap down tight around the shan end of thedrill bit, and prevents the air from escaping from1 the cylinder out?through the apertures 8 and 12 of the chuck Si) along the shank of thedrill bit to the atmosphere.

The hammer piston 4, which is made in two diameters, .1s reciprocallymounted in the two bores oi the cylinder. This piston hammer is rovidedwith an axial port 12A, that exten s into its rear end to within ashortdistance of its front end, and a circumferential row of yradialport holes 13B, is formed through the shell of thehammer to intersectthe forward end of the-axial port 12A. The rear end of the cylinder isalso rovided withl an axial aperture 17, whichis mteriorly threaded, anda cylinder head 17h?, having a hub portion 18, is screwed within thethreaded aperture 17, until a collar 19 onthe hub abuts against the endof the cylinder. An axial aperture 19A is formed in the outer end of thehub, which is interiorly threaded, and a fixed tubular piston rod 20 isthreaded at one end into it. This fixed piston rod is provided atitsouter end with a piston head 21, and the rod extends into a lonocylinder 21, which is termed the air workings or against any suitableabutment where the drilling engine is used. 'lhe opposite end of the airfeed cylinder is slightly tapered and threaded, and a sleeve 22, havinga tapered threaded bore at one `end, is secured upon this end of the airfeed cylinder. Ihe bore at the opposite end of the sleeve 22, isthreaded for a short distance, and is of less diameter than the innerend of the tapered bore, an unthreaded and plain bore 23, being formedbetween the two threaded portions, which terminates in a shoulder, wherethe smaller threaded bore begins. In this smooth bore 23, is placed asplit sleeve 24, preferably of soft metal, and this split sleeve fitssnugly upon the piston rod, and4 within the outer sleeve 22, and forms abearing, which prevents the inner end of the air feed cylinder fromsagging, and thus assures a smooth travel of the cylinder uponthe\piston and rod. When the drill is shipped or moved from place toplace, the split sleeve is removed by removing the sleeve 22, which isagain screwed upon the end of the feed cylinder. I'he cylinder is thenmoved vup on the piston rod, and the sleeve engages and is screwed uponthe outer end ol' the hub 1S, which is threaded, as shown, and the twoparts of the drill are thus coupled together, and prevented frombecoming separated.

An actuating fluid inlet aperture 25 is formed in the hub 1S, whichintersects-the axial aperture of the hub and of the fixed piston. Anipple fitting 26 is threaded to the inlet 25, and a three-way valve 27is threaded to the nipple. lhis valve comprises globe body portion orcasing, having three fluid entrance or outlet apertures 23, 29, and 30,a circular valve 31, and a valve stem stuffing box portion 32, which isplaced in alinement with the valve seat. A valve stem 33 is operativclymounted in the stuffing boxportion of the valve,` and the valve 31 ismounted on the inner end of the valve stem. This valve comprises a plughaving a transverse port 34, extending through it, and a port 35, atright angles to the port 34, which extends half way through the valve,and intersects the port 34. '1`he fluid apertures 2S and 29 of the valve27, are arranged in alinement, and communicate respectively with thehammer pistoncylinder and with the air feed cylinder, and the aperture30, is at right angles to them, and communicates with the port in thehub 18 an'd the hollow fixed piston of the feed cylinder. To the fluidaperture 28 of the valve, I connect one end of a nipple 36, to which oneend of a Ahose 37 is connected, and the opposite end of this hose isconnected to a nipple 38, which is threaded to one endl of an elbow 39,the opposite end of which is threaded to an inlet port 40, formed in thehammer piston cylinder. To the fluid aperture 29 of the valve, I secureone end ofa nipple 41, to the opposite end of which one end of a hose 42`is connected, the opposite end of which leads to a supply of anysuitable actuated fluid, which preferaby is cornpressed air.

While the feed cylinder is adapted to be used asan abutment for thehammer piston cylinder, it can be held by` any suitable chuck, and besupported on a stopping bar or column, which is a common way ofsupporting rock drills in mine workings. A collar portion 43 is formedon the rear end portion of the hammer piston cylinder, and two handles44 are secured to it at one end, and are arranged to radiate from it andare adapted to be grasped by the hands of an operator, and the hammerpiston rotatablyT oscillated to and fro, as the drill bit drills intothe rock.

The operation of my improved rock drilling engine is as follows; 'therock drilling engine is placed in position to drill a hole in rock, andassuming that the feed cylinder is to be used Without a chuck andcolumn, its abutment point is placed against a suitable abutment, andthe three-way valve is turned to the position shown in Ilig. 3, so as toadmit the actuating fluid into the hub and hollow piston rod, throughWhich it flows to the rear end of the piston and feed cylinder, where itforces the piston and the piston hammer cylinder forward until thedrill-bit bears against the rock. The threeway valve is then turned tothe position shownin Fig; 4, to admit the actuating fluid, which willthen flow to the hammer piston cylinder at the same time it is flowingcontinuously to the feed cylinder, and the actuating fluid reciprocatesthe hammer piston, moving it backward by flowing into the inlet port 40and against the shoulder 40^ ofthe iston until the port holes 13Bregister with the inlet port, when the air flows into and through theminto the axial port 12^ of the piston hammer, and thence to the rear endof the cylinder, where it expands against the greater area of the rearend of the hammer piston, which is thereby driven forward against theend of the drill-bit, which is driven against the rock, and when thehammer piston reaches its forward stroke, the air from the rear-end ofthe cylinder exhausts through the' port holes 13B into the chamber 7,and through the exhaust port 7^ tothe atmosphere, a portion of theexhaust air escaping through the passage 9^ of the bit.` In the rockdrilling engines in common use, the exhaust air rushes into the portwith such force that it flows along the shank of the drill bit, andblows the rock dust back into the face of the o erator, but this faultis completely obviated by the use of my flexible rubber washer, and theconstruction of the chuck and front end' of the cylinder enables thewasher to be secured around the shank of the drill-bit, and looselywithin the neck of metal; the terminal end portion of the drillbitprojects into, and through, and lies close enough around and against thedrill-bit, so that when the air rushes into this port it surrounds andstrikes this hub portion with such force that it is compressed andclosed tightly around and against the shank oi the drill bit tight'enough to prevent the air from iioWing along the drill-bit in anyperceptible quantity., and thus completely eradicates and overcomes avery disagreeable feature of the drilling engines in'use.

'lhe three-way valve enables an operator to set his drilling engine andmove the drill bit againstthe rock into operative rock drillingposition, before the air is turned into the piston hammer cylinder.After the drilling engineis set and the piston hammer is at work, theoperator oscillates the piston hammer cylinder by grasping the handlesand partially rotating this cylinder to and fro, thus rotating the drillbit step by step so that it w'illstrike in a new place m-the hole' beingdrilled, at each blow of the piston v hammen While I have' illustratedya preferred form "of three-way valve, I do not Wish to be limitedto it,as my invention contemplates the use of any operative three-way valvethat dependent of 'the other, or both at the same vtime Having describedmy invention, what i ,fclaim as new and desire"to secure-by Letters-"Patent, is:

l. In a rock drillfthe combination of the jpiston hammer cylinder,provided with an operative piston hammer, and a drill .bit arranged intlie operative path of said piston hammer, a chuck in said cylinderarranged to support said drill-bit, a neck portion in said cylinderprovided with an axial bore surrounding said drill bit and registeringwith the bore of said piston hammer, and a flexible washer securedbetween said chuck and the adjacent side of said neck portion, having ahub portion extending into the axial aperture oi said neck portion andsurrounding said drill bit.

2. In a lock drill, the combination of the piston hammer cylinderrovided with a reciprocatingdrill bit stri 'ng piston hammer, a drillbit holding chuck extending into the drill bit holding end of saidcylinder, a neck portion in said cylinder provided with an axial'bore,adapted to receive the shank end of a rock cutting drill bit andregistering with the piston hammer bore of said cylinder, a drill bitprovided with a .shank end supported by said chuck and extending looselyinto and through said neck portion, and a flexible washer secured insaid cylinder between said chuck and the adjacent side of said neckportion, provided with a hub portioniextending loosely into and throughsaid JOHN A. TR'AYLOR.

Q Witnesses: I v t T. B. BURNITE, E. D. TRAYLOB.

